senddynamicimage

说明：  像当一个web页面带有image/jpeg (或者其他的图像格式)的MIME类型被发送时，你的浏览器将那个返回结果当作一个图像，然后浏览器显示图像，作为页面的一部分或者完全作为图像自身。要为你的jsp页面设置MIME类型，你需要设置页面的contentType属性
(example, when a web page with image/jpeg (or other image format) of MIM E types are sent, your browser will return to that as a result of images and then display the image browser. as part of the page or as a completely self-image. To your jsp pages set MIME types, you need to set the page attribute contentType)